placing position numbers on a query output

Hello, All,

 

I would like to know if Postgres has a function similar to ROW_NUMBER().

I would like that the output of a query looked something like this

 

     column1   column2

1       x1              x2

2       y1              y2

3       z1              z2

...

 

I suspect that my question has an easy and quick answer, but from my searches I couldn't find it yet :-(

 

Any help deeply appreciate

 

Best,

Oliveiros